NQ, which hired Marcum Bernstein Pinchuk LLP as its new auditor, did not give a reason on Friday for the dismissal of PricewaterhouseCoopers Zhong Tian.

In October, Muddy Waters called NQ a “massive fraud,” a charge the Chinese company rejected.

Shares of Advanced Micro Devices, Inc.(NYSE:AMD) sank 17% in premarket trade Friday after the company’s second-quarter adjusted losses missed Wall Street estimates. The semiconductor company said after the closing bell Thursday that it had adjusted losses of $36 million, or 5 cents a share, compared with losses of $74 million, or 10 cents a share a year earlier. Revenue rose to $1.44 billion last quarter, from $1.16 billion in the same period a year earlier. Analysts polled by FactSet had expected adjusted per-share earnings of 3 cents on sales of $1.44 billion.